Signaling device.



M. J. WOHL & H. HERTZBERG.

SIGNALING DEVICE.

APPLICATION FILED MAE.16,1908.

962,687, Patented June 28, 1910.

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UNITED STATES PATENT OFFICE.

MAURICE J. WOI-IL, OF NEW YORK, AND HARRY HERTZBERG, OF BROOKLYN, NEW

YORK, ASSIGNORS T0 ABBOT A. WOI-IL, on NEW YORK, N. Y., AND TRUSTEES.

LONV, 0F HORSESHOE, NEW YORK; MAURICE J. HARRY HERIZBERG, OF BROOKLYN,NEW YORK,

SIGNALING- DEVICE.

To all whom it may concern:

Be it known that we, Haunrcn J. WoHL and HARRY HERTZBERG, citizens ofthe United States, and residents, respectively, of the city of New York,borough of Manhattan, county and State of New York, and of the city ofNew York, borough of Brooklyn, county of Kings, and State of New York,have invented certain new and useful Improvements in Signaling Devices,of which the following is a specification.

The object of this invention is to produce a signaling device in whichan audible signal is caused by the vibration of a diaphragm through theexpansion and contraction of a thermal expansible conductor.

To this end, the invention consists broadly in a signaling device havinga diaphragm and a thermal expansible conductor connected with saiddiaphragm and arranged so that the alternate expansion and contractionof said conductor caused by the fluctuations of the current in theoperating circu1t vibrates said diaphragm and produce an audible signal.

The invention is illustrated in the accompanying drawing, which shows alongitudinal section through a receiver embodying the novel principle.

In this drawing, 1 is the receiver casin and 2 the diaphragm, both verymuch as usual.

3 is a thermal expansible conductor or wire, most conveniently disposedlongitudinally within the receiver. This wire is of the greatest thermaldelicacy, so as to expand and contract slightly under the changes intemperature due to current varlations therein. The usual binding posts4: are provided for connecting this conductor in the receiver circuit.The conductor 3 is stretched between spring supports 5, to which it isconnected by tension adjusting devices 6. The conductor is connectedintermediate its length to a short, transversely disposed lever 7; saidconductor being connected to this lever at two points at opposite sidesof the pivotal axis thereof, so that contraction of the conductor swingsthe lever in one direction. Said lever is connected with the diaphragmby a wire 8, which may or may not be insulated from the conductor 3. Itis to be noted that the spring action of the dia- Specification ofLetters Patent.

Application filed March 16, 1808.

Patented June 28, 1910.

Serial No. 421,428.

phragm takes up the slack in conductor 3,

when the latter expands.

In order to prevent the diaphragm being vibrated as a result ofexpansion and contraction of conductor 3 which are due merely tovariations in the surrounding temperature, there is provided acompensating wire 9, which is also stretched between the spring supports5, being connected thereto by the tension adjusting devices 10. Thiswire is so selected as to have the same total linear expansion per unitchange in sur rounding temperature as the conductor 3. It follows,therefore, that changes in the surrounding temperature will not causethe conductor 3 to swing the lever 7; because the conductor andcompensating wire expand and cont-act equally under such condition, and,the compensating wire, being connected only to the spring supports 5,causes these latter to flex one way or the other by just this amount:therefore, the outer ends of the conductor sufli'er displacement, butnot the points on the conductor which are connected with the lever. Itwill be understood that the compensating wire 9 is suitably insulatedfrom the conductor 3, so as to carry no current.

In operation, the current fluctuations within conductor 3 cause thetemperature of the conductor to fluctuate, and this in turn createsvariations in the length of the conduc-. tor. These slight movements ofthe conductor 3 are transmitted to the diaphragm through the lever 7 andwire 8; and the resulting vibration of the diaphragm is audible as asignal.

What is claimed as new is:

1. A signaling device comprising a diaphragm, a thermal expansibleconductor in the signaling circuit, and mechanical multiplyingconnection between said conductor and the diaphragm.

2. A signaling device comprising a diaphragm, a lever, connectionbetween the lever and diaphragm, and a thermal expansible conductor inthe signaling circuit operatively connected intermediate its ends withsaid lever.

3. A signaling device comprising a diaphragm, a pivoted lever,connection between said lever and said diaphragm, a thermal expansibleconductor connected intermediate its length to said lever at two pointsat 0pposite sides of the pivot thereof, and supports between which saidconductor is stretched.

4. A signaling device comprising a diaphragm, a pivoted lever,connection between said lever and said diaphragm, a thermal expansibleconductor connected intermediate its length to said lever at two pointsat opposite sides of the pivot thereof, spring supports between whichsaid conductor is stretched, and a compensating wire, substantially asdescribed, also stretched between said supports.

5. A signaling device comprising a diaphragm, a thermal expansibleconductor in the signaling circuit, connection between said conductorand said diaphragm whereby expansion and contraction of the former dueto current variation therein vibrates the diaphragm, and compensatingmeans whereby expansion and contraction of said conductor due tovariations in surrounding temperature do not aitect the diaphragm.

Signed at New York in the county of Kings and State of New York, this12th day of March 1908.

MAURICE J. WOHL. HARRY HERTZBERG. WVitnesses JOSEPH F. GARCIA, GEO.VVELLING GIDDINGS.

